$$\frac{1}{2}X+Q=\frac{1}{3}X.$$
$Q=-\frac{X}{6}$
$$Q=\frac{1}{3}X-\frac{1}{2}X$$
$$Q=-\frac{1}{6}X$$
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$X=-6Q$
$$\frac{1}{2}X+Q-\frac{1}{3}X=0$$
$$\frac{1}{6}X+Q=0$$
$$\frac{1}{6}X=-Q$$
$$\frac{\frac{1}{6}X}{\frac{1}{6}}=-\frac{Q}{\frac{1}{6}}$$
$$X=-\frac{Q}{\frac{1}{6}}$$
$$X=-6Q$$
